Harbors & Ponds

Water Bodies Map

Harbors

Nantucket Harbor

Nantucket Harbor has an approximate area of 5,254 acres with a drainage basin of approximately 5,340 acres. Water quality has been monitored in Nantucket Harbor since 1990.

Madaket Harbor

Madaket Harbor and Long Pond make up a unique ecosystem encompassing approximately 9 square miles. These two systems are hydrologically connected via Hither Creek and the Madaket Ditch. Long Pond is somewhat isolated from the whole system, and may be evaluated as having separate water quality issues. It is relatively narrow and winding with depths of 4-6 feet with no deep basins.

  1. Tara Riley

    Shellfish Biologist

  2. Natural Resources

    Physical Address
    131 Pleasant Street
    2nd Floor
    Nantucket, MA 02554

    Phone: 508-228-7230

    Office Hours
    Monday through Friday: 9:00 am - 1:00 pm

    Appointments available. Answering machine updated daily with changes



Island-Wide Reports

Planning Documents

Ponds

Hummock Pond

Hummock Pond is a eutrophic coastal pond located on the southwest side of Nantucket Island. Hummock is approximately 2.3 miles long, running north to south with an average depth of 6 feet. The watershed to pond ratio, at an average is 15 to 1. The pond is approximately 142 acres in size with a surface drainage basin of approximately 2,227 acres and a groundwater drainage basin of approximately 2,000 acres. Hummock Pond is opened 2 times a year to enhance marine fisheries.

Long Pond

Madaket Harbor and Long Pond make up a unique ecosystem encompassing approximately 9 square miles. These 2 systems are hydrologically connected via Hither Creek and the Madaket Ditch. Long Pond is somewhat isolated from the whole system, and may be evaluated as having separate water quality issues. It is relatively narrow and winding with depths of 4 to 6 feet with no deep basins.

Miacomet Pond

Miacomet Pond is located on the south side of the island of Nantucket. Miacomet Pond has a surface area of 46 acres. There is a maximum depth of 11 feet near its southern end and the mean depth of the pond is 4.8 feet. The pond has a large surface water drainage area of approximately 1,284 acres based on the topography of the surrounding landscape. The probable area of groundwater drainage to Miacomet Pond is 1,047 acres.

Sesachacha Pond

Sesachacha Pond is a coastal eutrophic salt pond located on the northeast portion of Nantucket Island. It is a kettle pond with 2 deep basins of 15 to 18 feet on the northern and southern end. The surface area of the pond is approximately 266 acres with a drainage basin of 800 acres. Sesachacha Pond is opened 2 times a year to enhance marine fisheries.

Reports & Studies

To access to Ponds & Harbors past reports, visit the Town of Nantucket Digital Archives.